Animal vaccines are used for the prevention of diseases occurring in animals. Regular vaccination of animals reduces the chances of transmission of microorganisms in the animal population as well as animal suffering. The purpose of using animal vaccines is to prevent or reduce diseases in animals, hence promoting optimal patient, herd and public health. Animal vaccines are part of veterinary biologics (VB) and the products work primarily through the stimulation of the immune system in order to prevent or treat diseases. Veterinary biologics are regulated by the USDA Center for Veterinary Biologics (CVB) in the USDA’s Animal and Plant Health Inspection Service (APHIS). Livestock animals, such as turkeys, chickens and cattle, are vaccinated to protect against diseases such as rotavirus, E. coli, pinkeye and brucellosis.